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Acta Optica Sinica

D. C. Field-induced bigh Rydberg state mixing in MgI

Jianan Zhang

Published Jan 1, 1988• 0 citations
OpenAlex

Abstract

Multiphoton ionization and second harmonic generation (SHG) via two-photon forbidden 3s21S-3snp1P(n=16-21) resonance in Mg vapor have been observed and studied tn the presence of a DC electric field and were interpreted as 1-mixing of Rydberg states caused by external electric field. The experimental results are in agreement with theoretical explanation.

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Physical Review Letters•Apr 3, 1995•9 citations
Multiphoton ionization and second harmonic generation (SHG) via two-photon forbidden 3s21S-3snp1P(n=16-21) resonance in Mg vapor have been observed and studied tn the presence of a DC electric field and were interpreted as 1-mixing of Rydberg states caused by external electric field. The experimental results are in agreement with theoretical explanation.
The collision-induced two-photon forbidden 3s2 1S-3snp 1P transitions (n>11) and collisional enhancement of 3s2 1S-3sns 1S transitions (n>8) of Mg I have been observed and studied as functions of Mg vapour pressure and perturbing gas (Ar) pressure by using two-photon resonant ionisation and thermionic diode techniques. The occurrence of forbidden transitions and collisional enhancement of 3s2 1S-3sns 1S transitions is qualitatively attributed to the formation of a Rydberg Mg2 excimer and a MgxAry Fermi complex. Quantitatively, the above phenomena are interpreted as collisional mixing of high Rydberg states of Mg. The mixing coefficients are estimated by using perturbation theory and the semiclassical (JWKB) approximation. The theoretical estimation is in good agreement with the experimental result.
Multiphoton ionization (MPI) via two-photon resonance with high-lying Rydberg levels is observed on Na and K atoms in modest (12--120 V/cm) dc electric fields. The field-induced MPI signals are manifested to such an extent that the nominally forbidden MPI via two-photon resonance with the np levels is induced at the same signal levels as or more intensely than the allowed MPI via the ns and nd Rydberg levels. The intensity inversion between the allowed and the forbidden MPI signals is observed on the K atoms in the wavelength region where the two-photon energy is very close to the field-ionization limit.
Second harmonic generation (SHG) in atomic Li vapor is studied when the 2 2 S 1/2 -3 2 S 1/2 two-photon transition is resonantly excited. This is an SHG in a medium with inversion symmetry, with no externally apptied electric or magnetic field, and with no apparent multipole moments associated with the resonant excitation. The SH polarization is found to be parallel to the intensity gradient of the incident laser beam when a cylindrical lens focusing is applied. The mechanism of this highly forbidden SHG is explained by the radial electric field induced by free expansion of photo-electrons around the laser beam axis.